"The biggest threat to free Wi-Fi security is the ability for the hacker to position himself between you and the connection point. So instead of talking directly with the hotspot, you're sending your information to the hacker, who then relays it on. While working in this setup, the hacker has access to every piece of information you're sending out on the Internet: important emails, credit card information, and even security credentials to your business network. Once the hacker has that information, he can — at his leisure — access your systems as if he were you."-Kaspersky